English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/58662
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Hydrodynamic and chemical conditions during onset of a red-tide assemblage in an estuarine upwelling ecosystem

AuthorsÁlvarez-Salgado, Xosé Antón ; Figueiras, F. G. ; Villarino, M. L. ; Pazos, Yolanda
Issue Date1998
PublisherSpringer
CitationMarine Biology 130(3): 509-519 (1998)
AbstractThe hydrodynamics and nitrogen/silicon bio- geochemistry accompanying the development of a red- tide assemblage were examined in the RõÂa de Vigo (northwest Spain), a coastal embayment a ected by upwelling, during an in situ diel experiment in Septem- ber 1991. Despite a low N:Si molar ratio (0.5) of nutri- ents entering the surface layer, which was favourable for diatom growth, the diatom population began to decline. Limited N-nutrient input, arising from moderate coastal upwelling in a strati®ed water column, restricted net community production (NCP 630 mg C m)2 d)1). In addition, light-limitation of gross primary production (GPP 1525 mg C m)2 d)1) was observed. The rela- tively high f-ratio ( NCP:GPP) recorded (0.41, char- acteristic of intense upwelling conditions) would have been as low as 0.15 had not GPP been limited by light intensity. Temporal separation of carbohydrate synthe- sis during the photoperiod from protein synthesis in the dark could be inferred from the time-course of the C:N ratio of particulate organic matter. Severe light-limita- tion would lead to diatom collapse were the diatoms not able to meet all their energy requirements during the hours of darkness. Under the hydrodynamic, nutrient and light conditions of the experiment, an assemblage of red-tide-forming species began to develop, aided by their ability to migrate vertically and to synthesize carbohy- drates during the light in surface waters and protein during the dark at the 4 m-deep pycnocline. Thermal strati®cation, reduced turbulence, intense nutrient mineralization, and the limited nitrogen input through moderate upwelling were all favourable to the onset of a red-tide assemblage.
Description11 páginas, 2 tablas, 6 figuras.-- The final publication is available at www.springerlink.com
Publisher version (URL)http://dx.doi.org/10.1007/s002270050271
URIhttp://hdl.handle.net/10261/58662
DOI10.1007/s002270050271
ISSN0025-3162
E-ISSN1432-1793
Appears in Collections:(IIM) Artículos
Files in This Item:
File Description SizeFormat 
Hydrodynamic_chemical.pdf308,23 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.